An even easier to use plugin for misquotes and testimonials!
Use the intuitive and powerful rich text interface to add and edit quotes, using the 'featured image' functionality to add a thumbnail image. Then, use either the supplied widget, a simple shortcode, or a straightforward function in your theme to add either a specific quote or a random quote to your site.
This plugin is a fork of Perfect Quotes. I forked it because it's an excellent plugin. In some ways, it's more powerful and flexible than this one. I highly recommend it if this plugin is too simple for you and you don't need either the thumbnail feature or the rich text editing option.